A fossil species is found in the same rock layer with Fossil 3 and Fossil 4. When could this species have existed?
A) 500-245 MYA
B) 500-500 MYA
C) 540-245 MYA
D) 540-505 MYA

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.